Question

已知2x m次方 y的2次方与-3xy的n次方是同类项，计算m-(m的2次方n+3m-4n）+（2nm的2次方-3n）的值。

m=？n=?谢谢

Answer 1

同类项则m=1
n=2
所以原式=m-m²n+3m-4n+2m²n-3n
=m²n+4m-7n
=2+4-14
=-8